/* Modern Clean Minimalist Design for guiak.com */
:root {
  --bg-color: #ffffff;
  --bg-subtle: #f6f8fa;
  --border-color: #d0d7de;
  --text-main: #1f2328;
  --text-muted: #656d76;
  --link-color: #0969da;
  --link-hover: #0550ae;
  --accent-badge: #f3e8ff;
  --accent-badge-text: #6b21a8;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

.site-header {
  border-bottom: 1px solid var(--border-color);
  background-color: #ffffff;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo {
  height: 30px;
  width: auto;
  display: block;
}

.brand-badge {
  font-size: 11px;
  font-weight: 600;
  background: var(--accent-badge);
  color: var(--accent-badge-text);
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid #e9d5ff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  padding: 4px 6px;
  border-radius: 4px;
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
  background-color: var(--bg-subtle);
}

.lang-switch {
  font-size: 12px;
  font-weight: 600;
  margin-left: 10px;
  padding-left: 12px;
  border-left: 1px solid var(--border-color);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.lang-switch a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 2px 6px;
  border-radius: 4px;
}

.lang-switch a.active {
  color: var(--text-main);
  background-color: #eaeef2;
  font-weight: 700;
}

.main-content {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 60px 20px;
}

.hero-banner {
  text-align: center;
  margin: 10px 0 24px 0;
}

.hero-logo {
  max-width: 320px;
  width: 80%;
  height: auto;
}

h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.8px;
  margin: 0 0 12px 0;
  line-height: 1.25;
}

.lead {
  font-size: 17.5px;
  color: var(--text-muted);
  margin-bottom: 26px;
  line-height: 1.5;
}

h2 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.4px;
  margin-top: 36px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

h3 {
  font-size: 16.5px;
  font-weight: 600;
  margin-top: 22px;
  margin-bottom: 8px;
}

p {
  margin: 14px 0;
  color: var(--text-main);
}

a {
  color: var(--link-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  color: var(--link-hover);
}

.button-group {
  display: flex;
  gap: 12px;
  margin: 24px 0 32px 0;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background-color: #1f2328;
  color: #ffffff;
  border: 1px solid #1f2328;
}

.btn-primary:hover {
  background-color: #32383f;
  color: #ffffff;
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--bg-subtle);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: #eaeef2;
  text-decoration: none;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 18px;
  background: #ffffff;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 8px 0;
}

.card-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  margin: 0;
}

.notice {
  background-color: #fff8c5;
  border: 1px solid #d4a72c;
  border-radius: 6px;
  padding: 14px 18px;
  margin: 24px 0;
  font-size: 14px;
}

.notice-header {
  font-weight: 700;
  margin-bottom: 6px;
  color: #4d3800;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}

th, td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
}

th {
  background-color: var(--bg-subtle);
  font-weight: 600;
}

.contact-card {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-subtle);
  padding: 24px;
  margin: 24px 0;
}

.contact-detail {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  margin: 8px 0;
}

.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-subtle);
  padding: 24px 20px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

.notice-warning {
  background-color: #fff8c5;
  border-color: #d4a72c;
}

.notice-warning .notice-header {
  color: #7c4a03;
}

.notice-success {
  background-color: #dafbe1;
  border-color: #4ac26b;
}

.notice-success .notice-header {
  color: #1a7f37;
}